def println():
    print("这是包中的一个模块...")


import random


def randomStr(n, m):
    list2 = list()
    for i in range(n):
        s = ''
        for i in range(m):
            t = random.randint(65, 90)
            s += chr(t)
        list2.append(s)
    print(list2)
    return list2
